Narrative:

On or around nov/xx/97 I was notified by my employer that I had inadvertently flown one of our piper seminoles on oct/xa/97 over the prescribed time of an airworthiness directive. The janitrol heater that is installed in our seminoles is required to have a 100 hour inspection on new heaters or overhauled heaters with a new combustion tube assembly upon accumulation of 500 heater operating hours or 24 months, whichever occurs first, and thereafter at intervals not to exceed 100 heater operating hours or 24 months, whichever comes first. There is a status sheet in the beginning of the aircraft book which we receive when the aircraft is dispatched to us. This status sheet indicates dates and/or times that required inspections need to be completed. The heater hobbs time is located on the top portion of this status sheet. This was an oversight on my part. I wish I could go back in time and be more proactive in my preflight procedures but, unfortunately I cannot. I have learned from this experience and have become more detailed in my preflight operations. Supplemental information from acn 385871: this was a situation where I was flying as an instructor giving a student multi engine instruction. I did not follow the adage of always check your students, even if they already have certificates. This student missed the fact that the heater hobbs was overdue and I didn't doublechk the forms.

Related reports:

Google
 

Original NASA ASRS Text

Title: 4 INSTRUCTOR PLT RPTS ARE COMBINED BECAUSE THEY WERE ALL FLYING THE SAME ACFT, PA44-180 SEMINOLE, ON DIFFERENT DAYS AND TIMES, BUT ALL MISSED SEEING THE OUT OF DATE AIRWORTHINESS DIRECTIVE ON THE HEATER.

Narrative: ON OR AROUND NOV/XX/97 I WAS NOTIFIED BY MY EMPLOYER THAT I HAD INADVERTENTLY FLOWN ONE OF OUR PIPER SEMINOLES ON OCT/XA/97 OVER THE PRESCRIBED TIME OF AN AIRWORTHINESS DIRECTIVE. THE JANITROL HEATER THAT IS INSTALLED IN OUR SEMINOLES IS REQUIRED TO HAVE A 100 HR INSPECTION ON NEW HEATERS OR OVERHAULED HEATERS WITH A NEW COMBUSTION TUBE ASSEMBLY UPON ACCUMULATION OF 500 HEATER OPERATING HRS OR 24 MONTHS, WHICHEVER OCCURS FIRST, AND THEREAFTER AT INTERVALS NOT TO EXCEED 100 HEATER OPERATING HRS OR 24 MONTHS, WHICHEVER COMES FIRST. THERE IS A STATUS SHEET IN THE BEGINNING OF THE ACFT BOOK WHICH WE RECEIVE WHEN THE ACFT IS DISPATCHED TO US. THIS STATUS SHEET INDICATES DATES AND/OR TIMES THAT REQUIRED INSPECTIONS NEED TO BE COMPLETED. THE HEATER HOBBS TIME IS LOCATED ON THE TOP PORTION OF THIS STATUS SHEET. THIS WAS AN OVERSIGHT ON MY PART. I WISH I COULD GO BACK IN TIME AND BE MORE PROACTIVE IN MY PREFLT PROCS BUT, UNFORTUNATELY I CANNOT. I HAVE LEARNED FROM THIS EXPERIENCE AND HAVE BECOME MORE DETAILED IN MY PREFLT OPS. SUPPLEMENTAL INFO FROM ACN 385871: THIS WAS A SIT WHERE I WAS FLYING AS AN INSTRUCTOR GIVING A STUDENT MULTI ENG INSTRUCTION. I DID NOT FOLLOW THE ADAGE OF ALWAYS CHK YOUR STUDENTS, EVEN IF THEY ALREADY HAVE CERTIFICATES. THIS STUDENT MISSED THE FACT THAT THE HEATER HOBBS WAS OVERDUE AND I DIDN'T DOUBLECHK THE FORMS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.